Jisho

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Noun which may take the genitive case particle 'no', Na-adjective (keiyodoshi), Noun
1. optional; voluntary; arbitrary; random; discretionary; facultative; spontaneous; any
Noun which may take the genitive case particle 'no', Na-adjective (keiyodoshi), Noun
2. arbitraryMathematics
Wikipedia definition
3. ArbitrarinessArbitrariness is a term given to choices and actions subject to individual will, judgment or preference, based solely upon an individual's opinion or discretion. Arbitrary decisions are not necessarily the same as random decisions. For example, during the 1973 oil crisis, Americans were allowed to purchase gasoline only on odd-numbered days if their license plate was odd, and on even-numbered days if their license plate was even.
Read “Arbitrariness” on English Wikipedia
Read “任意” on Japanese Wikipedia
Read “Arbitrariness” on DBpedia

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